Thanks for reaching out. Is there any change in behavior if you try to reboot the Nucleus (press power button once, wait for it to fully turn off, wait 1 min, turn back on).
If no change with the reboot, are you able to connect the Nucleus HDMI output to a TV or monitor and see if it shows the proper IP address there?
We have a more in-depth Nucleus troubleshooting step-by-step guide at the following link, and if an RMA is needed it will guide you through the steps on how to submit this as well: